Court of Justice (Third Chamber) 28 February 2013, C‑425/11 (Katja Ettwein v Finanzamt Konstanz.)

JUDGMENT OF THE COURT (Third Chamber) 28 February 2013 ( *1 ) ‛Agreement between the European Community and its Member States, of the one part, and the Swiss Confederation, of the other, on the free movement of persons — Equal treatment — Self-employed frontier workers — Nationals of a Member State of the Union — Business income received in that Member State — Transfer of residence to Switzerland